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Linux Journal | August 2011 | Issue CoffeeScript | Git | Facebook | LSB | Beowulf | Unison ™ Writing Facebook Applications Understanding and Using Git Since 1994: The Original Magazine of the Linux Community Use AUGUST 2011 | ISSUE 208 | www.linuxjournal.com Podcasts to Share BUILD A Your Linux BEOWULF Knowledge HPC SYSTEM with the Add Nagios FedoraLiveCD Notifications Project to Your Screen Window LINUX STANDARD Make BASE JavaScript and Its Role Programming in the Easy with Community HOW TO PLAN CoffeScript YOUR OWN LINUX EVENT WITH GARETH GREENAWAY OF SCALE $5.99US $5.99CAN HOW-TO: 08 UNISON THE FILE SYNCHRONIZATION PROGRAM 0 09281 03102 4 10 Gig On Board Blazing Fast, Embedded 10Gb Ethernet 10G Rackmount Servers in the iX-Neutron server line feature the Intel® Xeon® Processor 5600/5500 Series, and come with 10GbE networking integrated onto the motherboard. This eliminates the need to purchase an additional expansion card, and leaves the existing PCI-E slots available for other expansion devices, such as RAID controllers, video cards, and SAS controllers. For more information on the iX-1204-10G, or to request a quote, visit: http://www.iXsystems.com/neutron 30% cost savings/port over equivalent Dual- Port 10 GB PCI Express add-on card solution KEY FEATURES: IPMI NIC . Supports Dual 64-Bit Six-Core, Quad- Core or Dual-Core, Intel® Xeon® Processor 5600/5500 Series GigE NICS . 1U Form Factor with 4 Hot-Swap SAS/ 10GbE NICS SATA 3.5” Drive Bays . Intel® 5520 chipset with QuickPath Interconnect (QPI) . Up to 192GB DDR3 1333/1066/800 SDRAM ECC Registered Memory (18 DIMM Slots) . 2 (x8) PCI-E 2.0 slots + 1 (x4) PCI-E 2.0 (in x8 slot -Low-Profile - 5.5” depth) . Dual Port Intel® 82599EB 10 Gigabit SFP+ - Dual Port Intel® 82576 Gigabit Ethernet Controller . Matrox G200eW Graphics . Remote Management - IPMI 2.0 + IP-KVM with Dedicated LAN . Slim DVD 10Gb Ethernet . 700W/750W Redundant AC-DC 93%+ Adapters High-Efficiency Power Supply Call iXsystems toll free or visit our website today! 1-855-GREP-4-IX | www.iXsystems.com Intel, the Intel logo, Xeon, and Xeon Inside are trademarks or registered trademarks of Intel Corporation in the U.S. and/or other countries. 1&1 DUAL HOSTING No other web host offers more expertise, know- how and quality service than 1&1. Double Security: Your website is simultaneously hosted in 2 locations in our high tech data center! High-speed Global Network: 210 GBit/s Connectivity Environmentally Responsible: 100% Renewable Energy Solid Technical Foundation: 1,000 In-house Developers SUMMER SPECIAL: 1&1 DUAL ADVANCED PACKAGE & * 1 YEAR FREE! Q2 FREE Domains QUNLIMITED Traffi c QASP, .NET, AJAX, LINQ, PHP5, Perl, SSI QFREE Private Domain Registration QDNS Management Q5 Microsoft® SQL Databases Q500 E-mail Accounts Q1&1 SiteAnalytics Q24/7 Toll-free Customer Support Q50 FTP Accounts Q1&1 WebsiteBuilder Need more domains? ® .com with FREE Private Registration just $4.99/fi rst year.* 1-877-GO-1AND1 www.1and1.com 1-855-CA-1AND1 www.1and1.ca * 24 month minimum contract term required for Dual Advanced offer. Set-up fee and other terms and conditions may apply. .com offer valid fi rst year only. After fi rst year, standard pricing applies. Visit www.1and1.com for full promotional offer details. Program and pricing specifi cations and availability subject to change without notice. 1&1 and the 1&1 logo are trademarks of 1&1 Internet AG, all other trademarks are the property of their respective owners. © 2011 1&1 Internet, Inc. All rights reserved. AUGUST 2011 CONTENTS Issue 208 FEATURES 34 A CONFERENCE PRIMER WITH GARETH GREENAWAY Geek Wrangling 101, with an expert. Shawn Powers 42 FACEBOOK APPLICATION DEVELOPMENT Port your Web app to Facebook. Mike Diehl 48 LINUX STANDARD BASE: STATE OF AFFAIRS LSB and what it means for the Linux community. Jeff Licquia, Stew Benedict and Vladimir Rubanov 54 GIT A guide to what many consider the best version control tool ever created. Henry Van Styn ON THE COVER • How to Plan Your Own Linux Event with Gareth Greenaway of SCALE, p. 34 • Writing Facebook Applications, p. 42 • Understanding and Using Git, p. 54 • Build a Beowulf HPC System with the FedoraLiveCD Project, p. 64 • Linux Standard Base and Its Role in the Community, p. 48 • Use Podcasts to Share Your Linux Knowledge, p. 60 • Add Nagios Notifications to Your Screen Window, p. 24 • Make JavaScript Programming Easy with CoffeeScript, p. 16 • How-To: Unison the File Synchronization Program, p. 73 2 | august 2011 www.linuxjournal.com They say work smarter, not harder. They must be using our processor. The next generation of intelligent server processors The Intel® Xeon® processor 5600 series automatically regulates power consumption to combine industry-leading HQHUJ\HIÀFLHQF\ZLWKLQWHOOLJHQWSHUIRUPDQFHWKDWDGDSWV to your workload. Check out the new intelligent features of the Xeon® 5600 at intel.com/itcenter. Servers from iXsystems feature the Intel® Xeon® processor 5600 series. iX2216-10G 5IFiX2216-10GGFBUVSFTEVBMPOCPBSE t%VBM*OUFM® Xeon® 5600 Series Processors *OUFM®&#(JHBCJU4'1 1PSUT t6'PSN'BDUPSXJUITJYUFFO4"44"5")PU4XBQ ® EVBMPOCPBSE*OUFM (JHBCJU1PSUT %SJWF#BZT Enterprise Servers BOE%*..TMPUTTVQQPSUJOHVQUP(# t0O#PBSE%VBM1PSU*OUFM®&#(JHBCJU4'1 for Open Source PG%%3&$$3FHJTUFSFENFNPSZ*EFBMGPS www.iXsystems.com )1$ %BUB$FOUFS 7JSUVBMJ[BUJPO $MVTUFSJOH 1-855-GREP-4-IX BOE$MPVE$PNQVUJOHBQQMJDBUJPOT iX1204-10G 5IFiX1204-10GGFBUVSFTUIFMBUFTU*OUFM® ® Xeon® 5600 Series Processors Intel is not responsible for and $16TCBTFEPOUIFONBOEON t%VBM*OUFM has not verifi ed any statements OFYUHFOFSBUJPONJDSPBSDIJUFDUVSF5IFOFYU t6'PSN'BDUPSXJUI)PU4XBQ4"44"5"%SJWF#BZT or computer system product- TUFQJOJOUFMMJHFOUQFSGPSNBODF BVUPNBUFE t0O#PBSE%VBM1PSU*OUFM®&#(JHBCJU4'1 specifi c claims contained herein. FOFSHZFGýDJFODZ BOEþFYJCMFWJSUVBMJ[BUJPO © 2010, Intel Corporation. All rights reserved. Intel, the Intel logo, Intel Sponsors of Tomorrow, Intel Xeon, and Xeon Inside are trademarks of Intel Corporation in the U.S. and other countries. *Other names and brands may be claimed as the property of others. AUGUST 2011 CONTENTS Issue 208 COLUMNS 16 Reuven M. Lerner’s At the Forge Introducing CoffeeScript 22 Dave Taylor’s Work the Shell Calculating Day of the Week 24 Kyle Rankin’s Hack and / Nagging Notifications 77 Kyle Rankin and Bill Childers’ Tales from the Server Room It’s Always DNS’s Fault! 30 BLU-RAY 80 Doc Searls’ EOF First Brazil, Then the World INDEPTH 60 Podcasting Do you know something about Linux? A podcast is an excellent way to share your knowledge with others. Charles Olsen 64 How to Build a Beowulf HPC System Using the FedoraLiveCD Project Build a Red Hat-based Beowulf Cluster using a 73 UNISON kickstart file and tools from the FedoraLiveCD project. Howard Powell 69 Radio Dramas in Linux Tips and tricks for creating radio dramas with open-source software. Dan Sawyer 73 Unison, Having It Both Ways The file synchronization tool that supports bidirectional updates of files and directories. Adrian Klaver IN EVERY ISSUE 8 Current_Issue.tar.gz 10 Letters 12 UPFRONT 28 New Products 30 New Projects 69 RADIO DRAMAS 65 Advertisers Index 79 Marketplace USPS LINUX JOURNAL (ISSN 1075-3583) (USPS 12854) is published monthly by Belltown Media, Inc., 2121 Sage Road, Ste. 310, Houston, TX 77056 USA. Periodicals postage paid at Houston, Texas and at additional mailing offices. Cover price is $5.99 US. Sub scrip tion rate is $29.50/year in the United States, $39.50 in Canada and Mexico, $69.50 elsewhere. POSTMASTER: Please send address changes to Linux Journal, PO Box 16476, North Hollywood, CA 91615. Subscriptions start with the next issue. Canada Post: Publications Mail Agreement #41549519. Canada Returns to be sent to Pitney Bowes, P.O. Box 25542, London, ON N6C 6B2 4 | august 2011 www.linuxjournal.com More TFLOPS, Fewer WATTS Microway delivers the fastest and greenest floating point throughput in history 2.5 TFLOPS Enhanced GPU Computing with Tesla Fermi 480 Core NVIDIA® Tesla™ Fermi GPUs deliver 1.2 TFLOP single precision & 600 GFLOP double precision performance! New Tesla C2050 adds 3GB ECC protected memory New Tesla C2070 adds 6GB ECC protected memory Tesla Pre-Configured Clusters with S2070 4 GPU servers WhisperStation - PSC with up to 4 Fermi GPUs OctoPuter™ with up to 8 Fermi GPUs and 144GB memory New Processors 12 Core AMD Opterons with quad channel DDR3 memory 8 Core Intel Xeons with quad channel DDR3 memory Superior bandwidth with faster, wider CPU memory busses Increased efficiency for memory-bound floating point algorithms Configure your next Cluster today! 10 TFLOPS 5 TFLOPS www.microway.com/quickquote 508-746-7341 FasTree™ QDR InfiniBand Switches and HCAs 45 TFLOPS 36 Port, 40 Gb/s, Low Cost Fabrics Compact, Scalable, Modular Architecture Ideal for Building Expandable Clusters and Fabrics MPI Link-Checker™ and InfiniScope™ Network Diagnostics FasTree 864 GB/sec Achieve the Optimal Fabric Design for your Specific Bi-sectional Bandwidth MPI Application with ProSim™ Fabric Simulator Now you can observe the real time communication coherency of your algorithms. Use this information to evaluate whether your codes have the potential to suffer from congestion. Feeding observed data into our IB fabric queuing-theory simulator lets you examine latency and bi-sectional bandwidth tradeoffs in fabric topologies. GSA Schedule Contract Number: GS-35F-0431N pC2_Microway.indd 1 7/15/10 9:20:43 AM Executive Editor Jill Franklin [email protected] Senior Editor Doc Searls [email protected] Associate Editor Shawn Powers [email protected] Art Director Garrick Antikajian [email protected]
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